—Do you know Tsering Danzhou, a Tibetan ten-year-old boy in Yushu?

—Yes. He       the people his great help as a translator after the earthquake.

A．provided

B．supported

C．offered

D．Afforded

计算机系统由软件系统和（ ）两部分组成。

A．操作系统

B．硬件系统

C．文件系统

D．主机系统